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EBTJV Project Overview

EBTJV Project Overview. Riparian planting tool Brook trout habitat patch layer. Riparian Planting Tool. Purpose To help locate & prioritize locations where tree plantings would be most beneficial Data Canopy cover layer (30 M raster) Solar radiation layer (30 M raster)

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EBTJV Project Overview

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  1. EBTJV Project Overview • Riparian planting tool • Brook trout habitat patch layer

  2. Riparian Planting Tool • Purpose • To help locate & prioritize locations where tree plantings would be most beneficial • Data • Canopy cover layer (30 M raster) • Solar radiation layer (30 M raster) • NHD+ Stream layer w/ 100 M buffer • End Product • Web-based GIS tool

  3. Riparian Planting Tool • Web-tool features • User-specified threshold values • % Canopy cover • <= 70% • % Rank of solar radiation • >= 75% • User-specified spatial extent • Select based on various geographic & hydrologic layers • Maryland • Brook trout habitat patch • Makes ranking of solar radiation values more relevant

  4. Data

  5. Frostburg

  6. Frostburg

  7. Frostburg

  8. Frostburg

  9. Riparian Planting Tool • Currently developing web-tool • Will be housed on Appalachian LCC website • Suggestions for new/improved features

  10. Habitat Patch Layer • Purpose • To update initial brook trout assessment performed at the sub-watershed scale to the catchment scale • Data • NHD+ Catchment layer • State trout sampling data • Dams/Lakes layer • End Products • Brook trout habitat patch layer • NHD+ catchment layer w/ trout occurrence labels

  11. Current Patch Layer • Current patch layer completed for PA south • Requested data from remaining states in April

  12. State Data

  13. Habitat Patch Layer • Currently writing script to automate process • Speed up analysis/reduce error • Patches more numerous in northern states • Reproducable • Enable retrospective analysis • Produce patch layers through time • Quantify patch loss • Establish framework for future analyses • Occupancy models • Catchments assigned probability of having brook trout

  14. Field Testing • Determine if “patch” is appropriate scale • Do large patches contain multiple populations • Sample patches over range of sizes • Explain patch effective number of breeders (Nb) by patch size

  15. Patch Size & Populations 1,217 Ha 10,880 Ha 3,807 Ha

  16. Sampled Patches • Size range • 509 to 11,570 Ha • Used sub-sampling strategy detailed in Whiteley et al 2012

  17. Preliminary Patch Nb Results Habitat remediation/Stable Summer flows Sympatric with Rainbow trout

  18. VA Patches Sampled Patches Prioritized Patches Unsampled Patches

  19. Field Testing Conclusions • Patch proper scale for brook trout management • Layer for entire brook trout range in development • Nb predictive model appears feasible • Outliers have reasonable explanations • Continue to add patches & develop model

  20. Acknowledgements Matt Burak, Maili Page & Gonzalo Mendez conducted genetic analyses The following organizations provided financial assistance or volunteer support: James Madison UniversityGeorge Washington and Jefferson National ForestVirginia Department of Game and Inland Fisheries U.S. Forest Service, Northern Research Station University of Massachusetts Amherst U.S. Geological Survey, Leetown Science CenterConte Anadromous Fish Research Laboratory

  21. Nb vs. Abundance

  22. PopulationMonitoring • Genetics • Nb – Effective number of breeders • Combines number of parents and family size • Lower values = fewer parents and/or skewed family sizes

  23. 2012 Patch Sampling

  24. Brook Trout Patches Virginia Patches (n = 331) Average size = 1,541 ha Median size = 855 ha

  25. Nb-to-Ne relationship • Used two FG YOY samples (2004, 2010) • Temporal Ne (Wang & Whitlock 2003) • Estimated Ne: 201.1 • Single-sample estimated Nb: 111.6 • Ne = gxNb= 1.91 x 111.6 = 213.2 • g from Letcher et al. 2007

  26. Sampling Strategies for Estimating Brook Trout Effective Population Size Jason Coombs – University of Massachusetts Andrew Whiteley – University of Massachusetts Mark Hudy – U.S. Geological Survey Zachary Robinson – University of Massachusetts Amanda Colton – U.S. Forest Service Ben Letcher – U.S. Geological Survey Keith Nislow – U.S. Forest Service

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